ANALYSIS APPARATUS, ANALYSIS METHOD AND PROGRAM

1 . An analysis apparatus for analyzing a causal relationship between an incidence of a predetermined disease and a predetermined intervention, comprising:

a memory; and

a processor configured to execute:

converting a plurality of first parameters indicative of attributes of users belonging to a population, at least two of the parameters having correlations with a predetermined strength, to a plurality of second parameters without the correlations with the predetermined strength with each other;

computing a predetermined score for each of the users, using the plurality of second parameters and a parameter indicative of presence or absence of the intervention; and

clustering the users belonging to the population using the score, to analyze the causal relationship.

2 . The analysis apparatus according to claim 1 , wherein the converting performs principal component analysis using the plurality of first parameters of the users belonging to the population and converts each one of the plurality of first parameters to a principal component point, to convert the plurality of first parameters to the plurality of second parameters.

3 . The analysis apparatus according to claim 1 , wherein the clustering clusters the users belonging to the population, using the parameter indicative of presence or absence of the intervention and the score, by matching a set of users with the intervention and a set of users without the intervention based on the score, or by dividing each of the set of users with the intervention and the set of users without the intervention into subclasses based on the score.

4 . An analysis apparatus for analyzing a causal relationship between a predetermined event and a predetermined intervention by propensity score analysis, comprising:

a memory; and

a processor configured to execute:

converting a plurality of covariates indicative of attributes of samples belonging to a population, at least two of the covariates having correlations with a predetermined strength, to a plurality of variables without the correlations with the predetermined strength with each other;

computing a propensity score for each of the samples, using the plurality of variables and a treatment variable indicative of presence or absence of the intervention; and

reconstructing a first group and a second group made by classifying the samples based on presence or absence of the intervention using the propensity score so that the covariates become similar.

5 . An analysis method executed by an analysis apparatus for analyzing a causal relationship between an incidence of a predetermined disease and a predetermined intervention, the analysis apparatus including a memory and a processor, the analysis method comprising:

converting a plurality of first parameters indicative of attributes of users belonging to a population, at least two of the parameters having correlations with a predetermined strength, to a plurality of second parameters without the correlations with a predetermined strength with each other;

computing a predetermined score for each of the users, using the plurality of second parameters and a parameter indicative of presence or absence of the intervention; and

clustering users belonging to the population using the score, to analyze the causal relationship.

6 . A non-transitory computer-readable recording medium having computer-readable instructions stored thereon, which when executed, cause a computer to function as the analysis apparatus according to claim 1 .